Molding flask



July 1,1930. l. R. SMITH MOLDING FLASK Filed March 21, 1929 A ll I INVENTOR.

Patented July I, 1 930 UNITED, STATES PATENT; oFF s.

IRVING B. SMITH, 01? MILWAUKEE, ,WISCO nsmgassrenon. To STERLING .BAnRowco rnNY, or wnsr ALLIS, WISCONSIN, A conronerron or W scons n MOLDING FLASK Application filed March 21, 1929. Serial No. 348,812.

My invention hasfrelation to improvements in molding flasks, and the method of making the same. r j I It is common. to form molding flasks of sheet metal having topand bottom flanges,

the corners of these flanges being formedvby bending around the metal at the cornersof the flask, which necessarily stretches the metal, resulting in thinness at the corners, and

10 consequent weakening thereof at the corners.

It is also well known that when a flask section is placed inthe olting machine and subjected to a jolting action, or when the sand within said flask section is rammed or tamped, the saidflask section is subjected to severe strain. i r a It is therefore one of the primary objects of my inventionto provide an improved flask section and method of forming the same whereby the necessity for bending the metal to form the cornersof the flanges is avoided, and hence increased, strength and durability is thereby secured, the construction and method also being such that the flanges ex-. tend at, or substantially at, right anglesto the main body portion of said flask'se'ction, form.- ing a comparatively sharp angle to the flanges at the point of their junction: with the flask section.

A further object ofthe invention is to provide an improved flask section, and method of forming the same, wherein edge flanges extend along the edges of the section except at the corners thereof, where separate corner blocks are provided forming corner continuations of the flanges,theflanges and corner blocks being welded to the flask section so as tobe integral therewitha A still further object of the invention is the provision of a flask section composed of two complementary parts welded together along their lines of junction, and eachpart being of the improved construction hereinafter set forth. i With the above main objects, and other'incidental objects, in view,theinvention consists of the parts and combinationof parts, or the equivalents thereof, and themethod steps hereinafter set forth. .1 f I In the accompanying drawing,-Fig. '1 is a view,,of a sheet of the metal which is used for forming one of the complementary parts of the flask section, the sheet being shown as broken away, and theview also showing the said-sheet after the flanges have been properly positioned thereon, but before being united thereto, looking on the inner sideof the metals I j p Fig. 2 is a cross-sectionof the sheet, the opposite'edges of which on the outside are cut at a bevel, the View also showing the flanges properly positioned to the upper'and lower beveled edges of the sheet or plate, but before the flanges are unitedto said sheet or plate by electric welding, the said flanges being also shown as cut away on their outer edges at a bevel, forming in conjunction with. the beveled edges of the sheet, V-shaped spaces or recesses. I

Fig. 3. is an enlarged cross-sectional viewof the sheet or plate and the upper. flange, after the flange has been united by electric weldmg. 1 I r Fig. 4. is a perspective view of one of the complementary parts of the flask section, after the flgngesand corners have been fully comp ete .1 v Fig. 5 isa detail'view of one of the corner pieces employed at each corner to complete the flanged formation. r

- Fig. 6 is an end view of Fig. 5, and I Fig. 7 is a perspective view of the complete flask section, with the two complementary parts thereof united.

In forming one of the complementary flask sections a plate of metal 8, preferably commercialplate metal,is employed, the upper I and lower edges thereof being out to form tapered or reduced portions 9-9, preferably, but not necessarily, forming beveled edges.

Top and bottomp inwardly extending flanges 10-10 having their outer edges of tapered or reduced form, as indicatedby the numeral 11,- are held against the tapered edges of the metal plate by anysuitable means, and

form, in conjunction with the edges of the plate, spaces or recesses 12, which recesses, if the edges are cut one bevel, are of V-shaped formation. c c a It is next necessary, in carrying out: the

method of producing the flask section, to secure the flanges 10-1O to the plate or sheet of metal, and this may be advantageously accomplished by the electric welding process, the welding metal filling up the spaces or recesses 12.

It will be noticed that in Fig. 1 of the drawing the upper and lower flanges are not continuous, that is, there are two breaks interrupting the continuity of both the upper and lower flanges, said breaks being indicated by the numeral 13. r

The next step in the method of forming the complementary flask section is to bend the sheet metal plate into the U-shaped'formation shown in Fig. 4 of the drawing.- It will be noticed thatthe breaks 13 of the flanges are so located that they will be positioned at the two corners of this U-shaped part of the flask section, whereby the necessity of the bending of the flanges around these two corners is entirely avoided.

It is necessary, however, to provide for completing the continuity of the flanges at the corners, or, in other words, filling in the corner spaces, and for this purpose 1 supply curved filling blocks 14. Fig. 5 of the draw ing shows a plan view of one of these filling blocks, and Fig. 6 shows an outside edge view thereof. From Fig. 6, and from the dotted line in Fig. 5, it will be seen that the filling block is provided with a tapered or reduced outside edge 15, preferably on a bevel.

As shown in Fig. 4, when these filling blocks are adjusted to the corners the flanges are made continuous,- and it then only remains to hold said blocks in place, which is also advantageously accomplished by electric welding, the welding metal filling the space between the tapered or reduced edge 15 of the block and the opposedtapered or reduced edge of the flask section at the corner thereof. It will be seen that there is produced, as a result of the foregoing operation, a flask section having an integralflange extending from its entire edge, including the corners thereof, with cornerbending of the flange entire- 1y absent and unnecessary. The other complementary part of the flask sections is made in precisely the same manner as above described, and Fig. 6 of the drawing shows the two complementary parts placed together and weldedto each other.

At opposite ends, fittings 1616 extend across the end joints of the adjusted together parts of the flask, and are riveted to said flask parts. These fittings are tubular, to form circular openings17 for the insertion of handles, not shown. The fittings are also provided, each, with a vertical opening 18 for the engagement therewith of a vertical pin used to connect together a plurality of superimposed flask sections.

As customary, other end handles 18 are provided.

From the foregoing description, it will be seen that I provide an improved flask section so constructed as to avoid the objectionable features referred to at the outset of this specification, and which exist in other forms of molding flasks.

Vhat I claim as my invention is:

1. A flask section, comprising a metallic main body portion bent angularly to form side and end portions, edge flanges extending at an angle from the main body portion, the continuity of said edge flanges being broken or interrupted at points registering with the corners of the body portion, thereby forming spaces at the corners, blocks fitting in said corner spaces anddisposed at an angle corresponding to the angle of the main flanged portions, and means for uniting the flangesto the main body portion, and for securing the blocks within the corner spaces.

. 2. A flask section, comprising a metallic main body bent angularly to form side and end portions, the edges of said side and end portions being tapered or reduced, edge flanges extending at an angle from the main body portion, the continuity of said edge flanges being broken or interrupted at points registering with the corners of the body portion, thereby forming spaces at the corners, andblocks fitting in the corner spaces, and also formed with tapered or reduced edges registering with the tapered or reduced edges of the side and end'portions of the body,

and a welding material filling the recesses formed between the registering tapered or reduced edges of the flanges and the corner blocks, and the body portion. 3. A- molding flask, consisting of two similarly constructed metallic parts united to-. gether, each part being angularly bent into U-shape to form one side and portions of 0pposite ends of the complete flask section, and having. a right angularly extending flange throughout its entire length, and characterized by the comparatively sharp angle of the flange at its junction with the body portion. 4. In a molding flask, commercial plate metal side walls at an angle with respect to one another, said walls having a substantially right angularly extending flange, and

means forsecuring said flange to said side walls to form a right angular juncture between the flange and the side walls as distinguished from a weak rounded juncture formed by bending.

5. In a molding flask, commercial plate metal side walls at an angle with respect to one another, said walls having a substantially right angularly extending flange, a portion of said flange projecting beyond the point of contact of said flange with the edge of the walls to form an angular space and means in said space for uniting the flange to the side walls. 0 I 6. Amolding flask comprising a metallic main body bent angularly to form side and end portions, the edges of said side and'end portions being tapered or reduced, each flange extending atan angle from the body portion, and Welding material filling the space formed between the tapered or reduced edges of the body portion and the flanges.

In testimony whereof, I aflix my signature.

IRVING R. SMITH. 

